I started at LLF on April 9th of 2009. As a personal trainer myself, I had been doing modified cross-fit workouts and eating paleo on my own since Oct 07. I considered myself in pretty good shape. However, my first workout was the filthy fifty. Holy guacamole! I was completely beat as it took me 47 min to complete it. Now, it's 5 Jun and things are a bit different. When I was doing modified xfit workouts at home, I wasn't going near the level I do at LLF. You've got the clock going, you've got everyone else cranking through the same thing...sometimes, it's a partner workout (very fun even with strangers). It's very motivating. I've learned that my mind will give out long before my body will. That's a very interesting thing to know about oneself. I also changed my diet as according to the zone blocks, I was under eating. That explained why I wasn't putting muscle on previously. I've gained 7lbs and my body fat has stayed at 8%. That's a result I'm happy with. I'm definitely getting stronger and I'm doing it without injury because there is so much focus on the technique. Chris and the trainers there are doing very good work. Thanks for doing Crossfit in SF! -Abraham